Sickle-grinder



L. V. SONNER.

SICKLE GRINDER.

APPLICATION FILED APR. 3, 1920.

1,369,569, Patented Feb. 22,1921.

2 SHEETS-SHEET l.

INVENTOR 4 M sow/van,

A TTORNEYS Patented Feb. 22,1921.

2 SHEETS-SHEET 2.

INVENTOR L K $ONNER,

ATTORNEYS L. V. SONNER'.

SICKLE GRINDER.

APPLI-ICATION men APR. 3 1920 UNITED STATES PATENT OFFICE."

LUKE VINCENT SONNER, 0F BUHL, IDAHO.

. SICKIiE-GRINDER.

Specificationof Letters Patent. Patentd Feb. 22, 1921.

Application filed April 3, 1920. Serial No. 370,939.

To all whom it may concern:

Be it known that I, LUKE VINCENT SON- NER, .a'citizen of the United States, and a tion being the provisionof a grinder having 1 simple and efficient means for rigidly supporting the sickle blade in convenient position for grinding, and driving means for a grinding element which permits of the universal movement of the grinding element so that it can be moved to any desired position with respect to the sickle blade for effecting the desired grinding of the'teeth of the blade.

I will describe one form of grinder embodying my invention and will then point out the novel features thereof in claims.

In the accompanying drawings- Figure 1 1s a vlew showing 1n top plan one form of grinder embodying my invention.

Fi 2 is a view showing in front elevation b the grinder shown in Fig. 1. V

Fig. 3 is a view showing the grinder in side elevation. V p p v Fig. 1 is a fragmentary sectional view showing the driving connection between adjacent sections of the driving shaft.

Fig. 5 is a detail perspective view of one section of the bed plate of the machine.

Similar reference characters refer to similar parts in each of the several views.

Referring specifically to the drawings, F designates generally a frame upon which the entire mechanism of the grinder is supported, such frame being formed of flat metallic bars arranged to provide a front rectangular portion 15 and a rear L-shaped portion 16 which is connected to the upper end of the portion 15 and held in proper spaced relation to the lower end of the portion 15 by brace rods 17 Rotatably mounted upon the front portion 15 at a point adjacent its lower end is an operating crank K which is journaled in bearings 18 secured to the vertical bars of the portion 15, as clearly shown in Figs. 2 and 3. The crank K comprises reversely disposed crank portions 19 and 19* which function as pedals for the feet of an operator in effecting a rotation of the crank. One end of the crank K extends laterally ing shaft S.

from the front portion 15 and into a gear casing G in which is adapted to be housed a train of gearing (not shown) of conventional form for appreciably increasing the speed of rotation of the section 20 of a drived at their confronting ends by a gear 24% as clearly shown in Fig. 4. A portion 0 the shaft sections of the shaft S are journaledin sleeves 25, such sleeves being preferably connected to each other as at 26. in Fig. 2. As shown in Figs..1, 2, and'3, the shaft section 23 is relatively short and is adapted to support thereon a grinding element E, such element in the present instance being an emery wheel which has a larger central diameter than either end diameter. The emery wheel E is, fixed to the shaft section 23 for rotation therewith and is locked against displacement therefrom by a bearing sleeve 27 formed on one end with a handle 28. The'bearing sleeve 27in turn is locked against displacement inthe shaft section 23 by a cotter pin 29.

As shown in Figs. 2 and is provided with a bed plate B upon which the work to be ground is adapted to be supported. This bed plate B is formed of two L-bars 30 and 31' whichare bolted or otherwise secured to the connected ends of the portions 15 and 16 in such manner that they are reversely disposed as is clearly shown in Fig. 3. The front bar 31 has its forward edge formed with teeth 31 which are designed to conform to the contour of the teeth of a'single blade C. The rear bar 30 is-provided with upstanding staples 31 through which extends the divergent portions of a wire shaped yoke Y. The rear end of the main portion of the yoke Y is formed with an eye through which extends a rod 32 that is slidably fitted in a bar 33 secured to the portion 16 of the frame F. Surrounding the rod 32 and interposed between the bar 33 and the yoke Y is a coiled expansible spring 3 1 which serves to bias the rear end of the yoke upwardly and to thereby force the divergent portion of the yoke downwardly toward the bed plate B. As a result of this arrangement it will be seen that the staples 31 act as fulcrum points for the yoke Y, and as the divergent portions of the yoke project partially across the bed plate B, it will be seen that they The driving shaft S is com-, pr sed of sectlons 20, 21, 22 and 23, any two ad acent sections being operatively connect- 3, the frame F v bed plate B of theyoke serve to securely clamp a 'piece of work to the bed plate.

The operation of the grinder is as follows:

The operator reposes upon a seat T supported upon the portion 16 of the frame F, and with his feet resting upon the cranks l9 and 19, rotation of the crank K can be readily effected to drive the shaft S which in turn causes a rotation of the emery wheel E. The sickle blade C is clamped upon the I? first pressing the rear end against the tension of the spring 34 thereby lifting the forward ends of the yoke so as to permit the insertion of the blade between the yoke and the bed plate. When applying the sickle blade to the bed plate, it should be seen that the teeth of the blade register with the teeth 31 of the bar 31 whereby, a rigid support is effected for the several teeth at the same time permitting the proper positioning of the ernery wheel in grinding the teeth, in the desired manner. The sickle blade having been positioned in this manner, the rear end of the yoke Y is released, thereby allowing the spring 34 to force the forward ends of the yoke into engagement with the blade and thus securely holding the same upon the bed plate.

In manipulatingl the emery Wheel, the operator grips the andle 28 with one hand and the sleeve 25 of the shaft section 22, with the other hand. In this manner the emery wheel can be moved to any desired position with respect to the blade C without in an way impeding the rotation of the wheel. s the shaft S is comprised of universally connected sections, it will be manifest that a wide range of movement is pervarious changes andmodifications may be made herein without departing from the spirit of the invention and the spirit and scope of the appended claims.

What I claim is: 1. A sickle grinder comprising, a bed plate on the frame, a wire shaped yoke fulcrumed on the bed plate, a rod slidably supported upon the frame and connected to said yoke,-a spring on the rod and arranged to bias theyoke toward said frame, a flexible shaft, a grinding element operable by said shaft, and means on the frame for driving said shaft.

2. A sickle grinder comprising, a frame, a bed plate supported von the frame and formed with teeth, a wire shaped yoke fulcrumed on the bed'plate, a rod slidably supported on the frame and connected to said yoke, a spring surrounding said rod and ar ranged to bias the yoke toward said bed plate, a crank shaft journaled on the frame,

a flexible shaft comprised of sections uni- Versally connected to each other and to said crank shaft, and a grinding element fixed to one of said sections.

g LUKE VINCENT SONNER. 

